IMPEDANCE MATCHING DEVICE OF WIDE BAND MONOPOLE ANTENNA FOR LOW FREQUENCY AND MONOPOLE ANTENNA HAVING THE SAME

摘要

PURPOSE: An impedance matching device of wide band monopole antenna for low frequency and a monopole antenna having the same are provided to implement the impedance matching for wide band with the low cost without using an auto matching unit. CONSTITUTION: A ferrite transformer(204) is electrically connected to a feeding unit. The ferrite transformer changes the impedance by coupling of the coils wound around with the ferrite core. A first turn is combined with the output signal of the ferrite transformer. One end of a second coil is electrically combined with the first turn. The other end of the second coil offers the power feed signal to the antenna radiator(200). The first turn and the second coil protect the ferrite core.